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. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95341 <br /> ' Certificate#2480 Phone: (209)384-2930 <br /> Fax: (209)3841507 <br /> FFTim <br /> Environmental, Inc. Client Project ID:Grewals Market <br /> lifornia Method:EPA 5030/8015M,8020 <br /> Reference Number:4392 Instrument ID:Var-GC1 <br /> d Matrix:Soil Extracted: 01-29-02 <br /> 95215 Analyst: Clavi Cone Analyzed: 01-30-02 <br /> lar <br /> Reported: 02-0$-02 <br /> E <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xyienes <br /> Spike Concentration: 2.20 42.0 26.4 159 36.8 184 <br /> Units: mg/kg' ug/kg ug/kg ug/kg 9 9 ug/kg ug/kg <br /> LCS Batch M VS-1292 VS-1292 VS-1292 VS-1292 VS-1292 VS-1292 <br /> LCS %Recovery: 89.6% 90.0% 101% 97.9% 103% 99.7% <br /> Surrogate Recovery: 97.9% 95.7% 95.7% 95.7% 95.7% 957% <br /> lipControl Limits: 70-130% 70-130% 70-130% 70-130% 70-130 % 70-130% <br /> MS/MSD Batch#: VS-1292 VS-1292 VS-1292 VS-1292 VS-1292 VS-1292 <br /> MS% Recovery: 70.5% 70.0% 78.6% 77.1% 81.5% 77.7% <br /> Surrogate Recovery: 75.8% 73.6% 73.6% 73.6% 73.6% 73.6% <br /> MSD%Recovery: 65.8% 70.6% 82.6% 76.7% 79.8% 76.6% <br /> ' Surrogate Recovery: 76.7% 74.3% 74.3% 74.3% 74.3% 74.3% <br /> Relative%Difference: 6.70% 0.847% 4.93% 0.438% ° <br /> 2.16/0 1.43% <br /> ' Methanol Blank: ND ND ND ND ND ND <br /> Surrogate Recovery: 108% 109% 109% 109% 109% 109% <br /> 1 <br /> Please Note: <br /> ' The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS %recovery is used for validation <br /> of sample batch results. Due to matrix effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br />' ANALYST: APPROVED BY: <br /> Clad J. o e Jams hil rAs <br /> L oratory Director <br /> 1 <br />